Galvanized piping- steel pipe coated with zinc to resist corrosion, has a dull silver or gray color and is threaded to other joints or appliances. the connection between galvanized pipe and copper pipe should have a dielectric coupler (brass connector) to prevent electrolysis or galvanic action that corrodes the pipe. Galvanized pipes rust from the inside out. Here are some tips and signs about galvanized pipes if you don't feel like crawling under your home to take a peek.
Problems Associated With Galvanized Piping:
It leaks at the joint connections because it is thinner at the threaded connections.
As the pipe wears, rust accumulates on the inside resulting in the restricted water flow.
Water may appear brownish,due to a build-up of rust inside the pipe(this will clear up after flowing water for a few seconds) You also may find staining in bathroom & kitchen sinks also in tubs or showers. Low water pressure may also be a sign of galvanized pipes becoming blocked with rust. (see picture)
Galvanized pipe corrodes more quickly when it comes in direct contact with copper; dielectric couplers are special connectors to prevent galvanic action or electrolysis.
It is subject to fractures more so than copper.
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Scott - I have a newer home (1.5 years), that has the red/blue tubing throughout with the central unit in the basement. I am getting brownish rust colored stains in my shower. It is cleanable but I have to do it very often. Do you have any quick answers as to what this might be? I have public water. Located in South Jersey.